<?php

/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Listens for changes within the Transport system.
 *
 * @package    Swift
 * @subpackage Events
 * @author     Chris Corbyn
 */
interface Swift_Events_TransportChangeListener extends Swift_Events_EventListener
{
	/**
	 * Invoked just before a Transport is started.
	 *
	 * @param Swift_Events_TransportChangeEvent $evt
	 */
	public function beforeTransportStarted(Swift_Events_TransportChangeEvent $evt);

	/**
	 * Invoked immediately after the Transport is started.
	 *
	 * @param Swift_Events_TransportChangeEvent $evt
	 */
	public function transportStarted(Swift_Events_TransportChangeEvent $evt);

	/**
	 * Invoked just before a Transport is stopped.
	 *
	 * @param Swift_Events_TransportChangeEvent $evt
	 */
	public function beforeTransportStopped(Swift_Events_TransportChangeEvent $evt);

	/**
	 * Invoked immediately after the Transport is stopped.
	 *
	 * @param Swift_Events_TransportChangeEvent $evt
	 */
	public function transportStopped(Swift_Events_TransportChangeEvent $evt);
}
